Add implementation

Author: prichodko

index.js

@@ -0,0 +1,50 @@
+'use strict'
+let { useState, useEffect } = require('react')
+let _throttle = require('lodash.throttle')
+
+let supportsPassive = false
+try {
+  var opts = Object.defineProperty({}, 'passive', {
+    get: function() {
+      supportsPassive = true
+    },
+  })
+  window.addEventListener('testPassive', null, opts)
+  window.removeEventListener('testPassive', null, opts)
+} catch (e) {}
+
+let getPosition = () => ({
+  x: window.pageXOffset,
+  y: window.pageYOffset,
+})
+
+let defaultOptions = {
+  throttle: 100,
+  passive: true,
+}
+
+function useWindowScrollPosition(options) {
+  let opts = Object.assign(defaultOptions, options)
+
+  let [position, setPosition] = useState(getPosition())
+
+  useEffect(() => {
+    let handleScroll = _throttle(() => {
+      setPosition(getPosition())
+    }, opts.throttle)
+
+    window.addEventListener(
+      'scroll',
+      handleScroll,
+      supportsPassive && opts.passive ? { passive: true } : false
+    )
+
+    return () => {
+      window.removeEventListener('scroll', handleScroll)
+    }
+  })
+
+  return position
+}
+
+module.exports = useWindowScrollPosition

package.json

@@ -0,0 +1,44 @@
+{
+  "name": "@rehooks/window-scroll-position",
+  "version": "1.0.0",
+  "description": "React hook for Window scroll position",
+  "main": "index.js",
+  "repository": "https://github.com/rehooks/window-scroll-position",
+  "author": "Pave Prichodko",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "keywords": [
+    "react",
+    "hooks",
+    "scroll"
+  ],
+  "files": [
+    "index.*"
+  ],
+  "scripts": {
+    "test": "ava test.js",
+    "example": "parcel example.html"
+  },
+  "peerDependencies": {
+    "react": "^16.7.0-alpha.0"
+  },
+  "devDependencies": {
+    "ava": "^0.25.0",
+    "browser-env": "^3.2.5",
+    "parcel": "^1.10.3",
+    "raf": "^3.4.0",
+    "react": "^16.7.0-alpha.0",
+    "react-dom": "^16.7.0-alpha.0",
+    "react-test-renderer": "^16.7.0-alpha.0"
+  },
+  "ava": {
+    "require": [
+      "./test-setup.js"
+    ]
+  },
+  "dependencies": {
+    "lodash.throttle": "^4.1.1"
+  }
+}